A 2D phosphonate MOF [Ni(Hptz)2]·7H2O}n (H2ptz = 4-(1,2,4-triazol-4-yl)phenylphosphonic acid) (2) is obtained through crystal transformation from a trinuclear compound [Ni3(Hptz)6·(H2O)6]·9H2O (1). Studies of chemical stability show that 2 retains its crystallinity in boiling water and organic solvents. 2 also exhibits high adsorption capacity for CO2 (80 cm3(STP) g−1) and selective separation of CO2 over N2.
二维膦酸盐 MOF [Ni(Hptz)2]-7H2O}n(H2ptz = 4-(1,2,4-三唑-4-基)苯基膦酸)(2)是由三核化合物 [Ni3(Hptz)6-(H2O)6]-9H2O (1)通过晶体转化得到的。化学稳定性研究表明,2 在沸水和有机溶剂中仍能保持其结晶性。2 还具有很高的 CO2 吸附能力(80 cm3(STP) g-1),并能选择性地分离 CO2 和 N2。
Water stable triazolyl phosphonate MOFs: steep water uptake and facile regeneration
作者:S. Begum、S. Horike、S. Kitagawa、H. Krautscheid
DOI:10.1039/c5dt02651b
日期:——
Triazole and phosphonate donors connect Co2+ ions to a water stable 3D framework with hydrophilic nanopores featuring water uptake at low relative pressure.
A phosphonic acid, 4-(1,2,4-triazol-4-yl)phenylphosphonic acid (H(2)ptz) was used as a new ligand to construct magnetic materials, by which two 2-dimensional (2D) layered metal phosphonates, [M-5(Hptz)(2)(ptz)(4)](n) (where M = Co(II) (1) and Mn(II) (2)) have been hydrothermally synthesized. Both compounds were characterized by elemental analyses, infrared spectroscopy, powder X-ray diffraction and X-ray single-crystal diffraction. Structure analyses reveal that 1 and 2 are isostructures, where the metal and ptz ligands form M-5(Hptz)(2)(ptz)(4) subunits, which are further linked together into a 2-D layered structure. The magnetism studies over the temperature range 2-300 K showed pronounced antiferromagnetic interactions between the combined oxo- and diazo-bridged metal centers in both 1 and 2. (C) 2013 Elsevier B.V. All rights reserved.
A two-dimensional Ni(II) coordination polymer built of 4-(1,2,4-triazol-4-yl)phenylphosphonate: Synthesis, structure and ferromagnetic magnetic property
Hydrothermal reaction of NiCl2 and H(2)ptz ligand leads to the formation of a two-dimensional Ni(II) coordination polymer, named as [Ni(Hptz)(mu(2)-Cl)]center dot 2H(2)O (1, H(2)ptz = 4-(1,2,4-triazol-4-yl)phenylphosphonate acid), which contains 1D Ni(II) chain structure with a Ni center dot center dot center dot Ni distance of 3.704 angstrom, and shows a (3,6)-connected net with a Schlafli symbol of (3.6(2))(2)(3(4).4(2).8(4).9(5)). Magnetic study reveals a ferromagnetic coupling mediated in the chain structure with a fitted J value of 5.0 K. Furthermore, theoretical calculation suggests that the exchange path of Ni-Cl-Ni with spin orbit of d(xz)-p(z)-d(xz) contributes mainly to the ferromagnetic coupling. (C) 2016 Elsevier B.V. All rights reserved.
Water-Mediated Proton Conduction in a Robust Triazolyl Phosphonate Metal-Organic Framework with Hydrophilic Nanochannels
The development of water‐mediated proton‐conducting materials operating above 100 °C remains challenging because the extended structures of existing materials usually deteriorate at high temperatures. A new triazolyl phosphonate metal–organicframework (MOF) [La3L4(H2O)6]Cl⋅x H2O (1, L2−=4‐(4H‐1,2,4‐triazol‐4‐yl)phenyl phosphonate) with highly hydrophilic 1D channels was synthesized hydrothermally